When the environmental life of two groups is more alike and the general cultural conditions more correspondent, the parallelism of thought and practice becomes more striking. The recently discovered Assyrian Code of Hammurabi (about 2500 B.C.) contains striking correspondences with the Mosaic code; and while Semitic scholars probably have good and sufficient reasons for holding that the Mosaic Code was strongly influenced by the Assyrian, we may yet be very confident that the two codes would have been of the same general character if no influence whatever had passed from one to the other.
The institutions and practices of a people are a product of the mind; and if the early and spontaneous products of mind are everywhere of the same general pattern as the later manifestations, only less developed, refined, and specialized, it may well be that failure to progress equally is not due to essential unlikeness of mind, but to conditions lying outside the mind.
Another test of mental ability which deserves special notice is mechanical ingenuity. Our white pre-eminence owes much to this faculty, and the lower races are reckoned defective in it. But the lower races do invent, and it is doubtful whether one invention is ever much more difficult than another. On the psychological side, an invention means that the mind sees a roundabout way of reaching an end when it cannot be reached directly. It brings into play the associative memory, and involves the recognition of analogies. There is a certain likeness between the flying back of a bough in one's face and the rebound of a bow, between a serpent's tooth and a poisoned arrow, between floating timber and a raft or boat; and water, steam, and electricity are like a horse in one respect—they will all make wheels go around, and do work.
Now, the savage had this faculty of seeing analogies and doing things in indirect ways. With the club, knife, and sword he struck more effectively than with the fist; with hooks, traps, nets, and pitfalls he understood how to seize game more surely than with the hands; in the bow and arrow, spear, blow-gun, and spring-trap he devised motion swifter than that of his own body; he protected himself with armor imitated from the hides and scales of animals, and turned their venom back on themselves. That the savage should have originated the inventive process and carried it on systematically is, indeed, more wonderful than that his civilized successors should continue the process; for every beginning is difficult.
When occupations become specialized and one set of men has continually to do with one and only one set of machinery and forces, the constant play of attention over the limited field naturally results in improvements and the introduction of new principles. Modern inventions are magnificent and seem quite to overshadow the simpler devices of primitive times; but when we consider the precedents, copies, resources, and accumulated knowledge with which the modern investigator works, and, on the other hand, the resourcelessness of primitive man in materials, ideas, and in the inventive habit itself, I confess that the bow and arrow seems to me the most wonderful invention in the world.
Viewing the question from a different angle, we find another argument for the homogeneous character of the human mind in the fact that the patterns of interest of the civilized show no variation from those of the savage. Not only the appetites and vanities remain essentially the same, but, on the side of intellectual interest, the type of mental reaction fixed in the savage by the food-quest has come down unaltered to the man of science as well as to the man of the street. In circumventing enemies and capturing game, both the attention and the organic processes worked together in primitive man under great stress and strain. Whenever, indeed, a strain is thrown on the attention, the heart and organs of respiration are put under pressure also in their effort to assist the attention in manipulating the problem; and these organic fluctuations are felt as pleasure and pain. The strains thrown on the attention of primitive man were connected with his struggle for life; and not only in the actual encounter with men and animals did emotion run high, but the memory and anticipation of conflict reinstated the emotional conditions in those periods when he was meditating future conflicts and preparing his bows and arrows, traps and poisons. The problem of invention, the reflective and scientific side of his life, was suffused with interest, because the manufacture of the weapon was, psychologically speaking, a part of the fight.
This type of interest, originating in the hunt, remains dominant in the mind down to the present time. Once constructed to take an interest in the hunting problem, it takes an interest in any problem whatever. Not only do hunting and fighting and all competitive games—which are of precisely the same psychological pattern as the hunt and fight—remain of perennial interest, but all the useful occupations are interesting in just the degree that this pattern is preserved. The man of science works at problems and uses his ingenuity in making an engine in the laboratory in the same way that primitive man used his mind in making a trap. So long as the problem is present, the interest is sustained; and the interest ceases when the problematical is removed. Consequently, all modern occupations of the hunting pattern—scientific investigation, law, medicine, the organization of business, trade speculation, and the arts and crafts—are interesting as a game; while those occupations into which the division of labor enters to the degree that the workman is not attempting to control a problem, and in which the same acts are repeated an indefinite number of times, lose interest and become extremely irksome.
This means that the brain acts pleasurably on the principle it was made up to act on in the most primitive times, and the rest is a burden. There is no brain change, but the social changes have been momentous; and the brain of each generation is brought into contact with new traditions, inhibitions, copies, obligations, problems, so that the run of attention and content of consciousness are different. Social suggestion works marvels in the manipulation of the mind; but the change is not in the brain as an organ; it is rather in the character of the stimulations thrust on it by society.
The child begins as a savage, and after we have brought to bear all the influence of home, school, and church to socialize him, we speak as though his nature had changed organically, and institute a parallelism between the child and the race, assuming that the child's brain passes in a recapitulatory way through phases of development corresponding to epochs in the history of the race. I have no doubt myself that this theory of recapitulation is largely a misapprehension. A stream of social influence is turned loose on the child; and if the attention to him is incessant and wise, and the copies he has are good and stimulating, he is molded nearer to the heart's desire. Sometimes he escapes, and becomes a criminal, tramp, sport, or artist; and even if made into an impeccable and model citizen, he periodically breaks away from the network of social habit and goes a-fishing.
The fundamental explanation of the difference in the mental life of two groups is not that the capacity of the brain to do work is different, but that the attention is not in the two cases stimulated and engaged along the same lines. Wherever society furnishes copies and stimulations of a certain kind, a body of knowledge and a technique, practically all its members are able to work on the plan and scale in vogue there, and members of an alien race who become acquainted in a real sense with the system can work under it. But when society does not furnish the stimulations, or when it has preconceptions which tend to inhibit the run of attention in given lines, then the individual shows no intelligence in these lines. This may be illustrated in the fields of scientific and artistic interest. Among the Hebrews a religious inhibition—"thou shalt not make unto thee any graven image"—was sufficient to prevent anything like the sculpture of the Greeks; and the doctrine of the resurrection of the body in the early Christian church, and the teaching that man was made in the image of God, formed an almost insuperable obstacle to the study of human anatomy.